Recent content by jdtm

In a way, the inductively coupled hour meters are superior in concept to a battery-operated one because it is possible to leave the key in the "on" position by accident and count hours when the machine is not running. Of course, they are better only if they work.

For anyone not aware, there are hour meters that can be installed on spark-ignition engines that only need a single wire put near a spark plug wire to show cumulative hours. The electrical energy going to the spark plug is inductively coupled to the wire, which triggers the meter to count run...